Problem: In a test to determine the resistance of a single-core cable, an applied voltage   2.5 V was necessary to produce a current of 2A in it at 15° C.   of   (a) Calculate the cable resistance at 55° C if the temperature coefficient of resistance of copper at 0°C is 1/235 per" C.   (b) If the cable under working conditions carries a current of 10A at this temperature, calculate the power dissipated in the cable.

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Q: The heating element of a coffeemaker operates at 120 V and carries a current of 7.70 A. Assuming the…

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Q: In Ohm's Law experiment, In order to measure the resistivity (at a given temperature) of an Ohmic…

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Q: So what is the equivalent resistance of this system [Ω]?

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Q: Suppose you wish to fabricate a uniform wire from a mass m of a metal with density p and resistivity…

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Q: The heating element of a coffeemaker operates at 120 V and carries a current of 7.70 A. Assuming the…

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Q: Nichrome alloy has a resistivity of 110 x 10-6 Ncm. From a roll of nichrome wire of 2.5 mm diameter,…

A: Given values: Resistivity, ρ=110×10-6 Ωcm Radius, r=2.5 mm2=1.25 mm Length, l=1 m

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A: Given : A = 3.5 x 10-7 m2 I = 2.8 A n = 7 × 1028 m-3

Q: The temperature coefficient of resistivity a is based on a reference temperature T, of 20.0°C and…

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Q: A current of 5 A exists in a copper wire of length 50 m and diameter of 2.5 mm when applying a…

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Q: A copper wire of 3.2 mm in diameter and 4 m length carries a certain amount of current. The…

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Q: A temperature-stable resistor is made by connecting a resistor made of silicon in series with one…

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Q: An immersion-type heating coil with a resistance of 13 ohms is connected to a 120 V outlet and…

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A: Given Resistivity ρ = 1.1 x 10-6 ohm.m Diameter D = 2 mm = 2 x10-3 m Length L = 1.5

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Q: H.W. 1.1: it is required to maintain a loading of 5 kW in a heating unit. At an initial temperature…

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Q: Nichrome alloy has a resistivity of 110 × 10^−6 Ωcm. From a roll of nichrome wire of 2.5 mm…

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Q: A wire is 1.3 m long and 0.97 mm2 in cross-sectional area. It carries a current of 5.0 A when a 1.6…

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Q: Using the results of the below example, find the drift velocity in a copper wire of twice the…

A: Fins the number of electrons. n=1eatom×6.02×1023atommol×1 mole63.54 g×1000 g1 kg×8.80×103…

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Q: A heating element is a (nichrome) wire with cross-sectional area of 2 x 10^-7 m^2 and is 1.3 m long.…

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Q: Consider a resistor of resistivity 3.96 × 10-8 Ω • m. If an electric field of 12 V/m is applied…

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Q: What is the resistance of a copper specimen with an initial resistance of 250 ohms at 30 degrees…

A: Given: Ro=250 ΩTo=30°CT = 48°Cα=1231.6( °C)-1 we have to calculate R at 48°C

Q: A coil of 400 turns is wound uniformly on an annealed steel core with a mean-circumference of 0.2 m…

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Q: Nichrome alloy has a resistivity of 110 × 10−6 Ωcm. From a roll of nichrome wire of 2.5 mm diameter,…

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Q: A circuit design calls for a 1.5-kΩ resistor to have 4.7 V across its terminals. What would he the…

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Q: Calculate the drift velocity and mean free path of copper when it carries a steady current of 10…

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.